Stripping apparatus for card flats



H. o. HESS 2,929,113

STRIPPING APPARATUS FOR CARD FLATS v March 22, 1960 3 Sheets-Sheet 1 Filed Aprj il a, 1957 N k mm Q /M. N s H 4 I W Qm H w ATTORNEY.

March 22,1960 H o. HESS Y 2,929,113

STRIPPING APPARATUS FOR CARD FLATS Filed April 8, 1957 3 Sheets-Sheet 2 Fig. 2

INVENTOR. HEINRICH Orr-o Hess.

' A Tram/En March .22, 1960 H. o. HESS 2,929,113

STRIPPING APPARATUS FOR CARD FLATS Filed April 8, 1957 3 Sheets-Sheet 3 l A Q 0 Fig. 9

IN V EN TOR. HEINRICH Orr-o Hsss.

ATTORNEK STRIPPING APPARATUSFOR CARD'FLATS Heinrich Otto Hess, Winterthur, Switzerland, assignor to Joh. Jacob Rieter 8; Co. Ltd., Winterthur, Switzerland, .a corporation of Switzerland Application AprilS, 1957, Serial No; 651,340

priority, application Switzerland April 13, 1956 's-cla'ims. (01.19-111 The present invention Erelates to .a fiat stripping apparatus for cardsandmore particularly :to. a suspension .brush rotating on a stationary axis. This brush, which provided with natural or synthetic bristles or steel wires, cannot satisfactorily clean the bottom of the flat so that a substantial'felt covering consisting of fibres is formed after a short period of time which adversely affects the carding operation.

The reason for the insufiicient action of a "brush rotating on a stationary axis is that such a brush can remove onlyfibres which are loosely deposited below the bends of the card wires. The fibres which are entangled with other parts of the fiat wires cannot 'be brushed off but are pressed by the brush towards the bottom of the flat Where they are matted with the already present fibres and increase the thickness ofthe felt covering.

It is an object of the present invention to provide a stripping apparatus which avoids the aforedescribed shortcomings. In the apparatus according to the invention the tips of brush wires which are mounted on a .cylindrical body move on a substantially cycloidal path relative to the moving flats, the points of the cycloidal path being located between the bottom of the flat and the plane in which the bends are located. The ascending portions of the aforesaid cycloidal path substantially conform with the inclination of the bent portion of the wires mounted on the flat.

The aforedescribed cycloidal path of the brush wires is produced by rotatably supporting the cylindrical brush on a swingably suspended frame, a spur gear wheel being coaxially connected with the brush which wheel is driven by a pair of pins rotating around a stationary axis and interposed between the fiat and the brush whereby the brush is simultaneously rotated and moved up and down.

Due to the particular suspension and drive of the flat stripping brush the fibres and waste adhering to the bottom of the flats are lifted and are stripped past the bends of the flat wires to the outside and removed.

By displacing the fulcrum on which the frame supporting the brush oscillates the path of the brush wires can be changed and adapted to suit different angles of the bends of the fiat wires.

The apparatus according to the invention aifords better cleaning of the card flats which is of particular importance when starting or restarting the card after a standstill, for example, for an overhaul because the card flats can be maintained clean from the start and an equilibrium between residual and brushed out fibres is established after a very short time. Carding is, therefore, uniformly effected shortly after starting the carding operation because the thickness of the layer of felt Uni d a e 1Patento formed byfibres at the roots of the fiat wires remains constant shortly after starting in contradistinction to .conventional arrangements which require ten to twenty or more operating hours for establishing steady conditions.

The novel features which are considered characteristic of the invention are set forthwith particularity in the appended claims. The invention itself, however, andadditional objects and advantages thereof will best be .understood from the following description of an embodi ment thereof when read in connection with the accompartying drawing in which: I

Fig. 1 is a diagrammatic cross sectional view vof card hats and a flat stripping apparatus located 'thereahove, the section being taken along line TI-jI in Fig. .2;

Fig. 2 is a longitudinal sectional view of one .half of a flat stripping brush and its suspension, the section be ing taken along line IIII in Fig. 1; the other half .of the flat stripping brush and its suspension is mirror-symmetric to the half shown;

Fig. 3 is a large scale diagram showing the paths .of'

,Fig. 1, is below a brush 3 which is rotatably supported 'bya frame 4 whichswings on pins 2. As seen inFig. 2, the frame 4 has two parallel swing arms of whichv only one is shown and which are interconnected by a hollow shaft 5 to which they are secured by pins 6. The hollow shaft 5 rotatably supports a tube, 7 by vmeans .of bearing bushings 8 provided at theends of the shaft and pressed into the end of the tube. Cylindrical brush bodies 9 and 9, preferably made of .wood, .are mounted on the tube coaxially thereof. Wire bristles 10 .are mounted on the body 9. and chain cleaning brushes ,11 are mounted on the body 9'.

For driving the brush 3 a spur gear wheel 13 is rotatably supported in a casing 12. Pins 15 and 16 extend from the hub of the wheel 13 in diametrically opposed relation and equidistantly from and parallel to the rotation axis of the wheel 13. The pins 15 and 16 extend into the gaps between the teeth of a gear wheel 17 which is coaxially mounted on the brush 3. Because of the weight of the brush and of the frame on which the brush rotates the wheel 17 always rests on one of the pins 15 or 16. The latter rotate in the direction of the arrow 13' (Fig. 1) around an axis which is stationary relatively to the card casing and alternately engage the wheel 17 I between two tooth flanks thereby rotating the wheel 17 i and simultaneously oscillating the frame 4, 5, 6 on the pins 2.

The aforedescribed arrangement causes periodic movement of the flat stripping brush 3 towards and from the flat wires 18 (Fig. 1) while the brush rotates around its axis at ununiform angular velocity. The fiat wires extend from a foundation 23 and have bends 21 located in a plane which is substantially parallel to the foundation 23, The tips 19 of the brush bristles 10 move along substantially cycloidal paths the points of reversal of which are located between the foundation 23 and the plane in which the bends of the flat wires are located. Three paths are shown in Fig. 3 and designated by letters A, B, and C. The three paths have somewhat different configurations because they represent oscillations made by the frame 4, 5, 6 on different fulcrums 2", 2", and 2. To accomplish this, the casing 12 is provided with three spaced holes into which the pin 2 can be selectively inserted. The path A, which is shown by a dotted line, is produced if the bore 2 is used as center of the swinging motion of the frame.

The path B, which is shown in a bore 2'. The path C, which is shown in dash-dot lines, is produced when the frame swings on the fulcrum 2'. This is the-constellation illustrated in Fig. 1.

When comparing the different paths it will be seen :that the paths, A and B, are far from parallel to the parts of the portion of the flat wires 18 below the bends 21, whereas the path, C, is substantially parallel to the portion of the flat wires below the bends 21. Fibres which are entangled with a flat wire below the bend, i.e., adjacent to the foundation 23 are, therefore, forced not only to overcome the friction between the fibres and the flat wires during the upward movement along the curves, A and B, but must also overcome the increasing friction produced by the slight advance of the tips 19 of the brush wiresli). Because of the advance of the tips 19 of the brush wires during the ascending movement on the paths, A and B, the fibres must move upward on the brush wires until the tips of the brush wires have at least reached the bends of the fiat wires. After passage of the bend the effect is similar but somewhat reduced, be-

cause, then, the angle of the intersection of the paths,

A and B, with the wires of the fiat becomes smaller. In

on the path, C, move only on the portions 22 far beyond the bend of the flat wires and there is no increase of friction because the advance of the tips 19 of the brush wires relatively to this portion of the flat wires becomes almost nil.

The portion 24 of the paths, A, B, and C, which extends along the circumference of the brush is due to the fact thatthe diameter of the circle 25 on which the pins and 16 are arranged in diametrical opposition is somewhat smaller than the distance between the centers of two circles, K and K", fitting in the bottom of neighboring gaps between teeth of the tooth wheel 17 and having a diameter which is equal to the diameter of the pins 15 and 16. Because of this, a pin 15 and 16 before arriving at a circle, K, or, K, engages the'fiank of a tooth revolving the wheel 17 resting on the pin and not lifting the wheel 17 until the pin slides along the tooth flank into a position coinciding with one of the circles,

K or K", whereupon the tooth wheel 17 is lifted; This brief circumferential movement 24 which is tangential of the fiat is sufiicient to effect seizure of loose fibres from contradistinction to this the fibres which are lifted on the wires 18. A subsequent rise of the brush wires pushes the fibres upward beyond the bends 21.

The movements have been analysed above under the assumption that the flat is stationary which is not the case in the actual operation'of-the device. This simplification, however, is permissible as long as the velocity of the movement 'ofthe flats is small relatively to the circumferential speed of the brush.

I claim:

1. In combination with a carding machine having flats including a foundation and flat wires extending therefrom and having bends located in a plane which is substantially parallel to said foundation, a card flat stripping apparatus comprising a casing, a frame, pivot means connected to said casing for vertically swingably supporting said frame, a cylindrical horizontal card flat stripping brush rotatably supported by said frame and having stripping wires extending between the flat wires, a gear coaxially connected to said brush, and a pair of parallel pins rotatable around, parallel to, diametrically opposed, and equally spaced from a stationary axis which is parallel to and in a plane below the rotation axis of said brush, said pins extending into the gaps betweenth e teeth of said gear for rotating and periodically lifting the latter and the brush-connected thereto for moving the tips of the brush wires along a substantially cycloidal path relative to the flat, the point of reversal of the cycloidal path being located between said foundation and the plane in ,Which the bends of said flat wires are located.

2. In the combination defined in claim 1, means for changing the location of said pivot means on said cas- 'ing.

References Cited in the file of this patent FOREIGN PATENTS 342,520 Great Britain Feb. 5, 1931 

